CN209835873U - Waste water treatment combines multiple-effect riser crystallization to divide salt device - Google Patents
Waste water treatment combines multiple-effect riser crystallization to divide salt device Download PDFInfo
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- CN209835873U CN209835873U CN201920586195.0U CN201920586195U CN209835873U CN 209835873 U CN209835873 U CN 209835873U CN 201920586195 U CN201920586195 U CN 201920586195U CN 209835873 U CN209835873 U CN 209835873U
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Abstract
The utility model aims at providing a waste water treatment that the function cost is low, the energy consumption is low, concentrated effectual and can export the by-product that reaches the industrial salt level combines multiple effect riser crystallization to divide salt device. The utility model discloses a preliminary treatment pond, electrocatalytic oxidation pond, electrodialysis unit, multistage forced circulation evaporation module and the play pond that connects gradually, multistage forced circulation evaporation module is including a plurality of heating evaporation module and the crystallizer that connects gradually, and heating evaporation module includes the heater, and multistage forced circulation evaporation module still includes plate heat exchanger. The utility model discloses be applied to waste water treatment's technical field.
Description
Technical Field
The invention relates to a waste water treatment combined multi-effect vertical pipe crystallization salt separation device.
Background
The existing wastewater treatment firstly needs a biodegradation system, and some chemical agents or activated sludge are added into the system for nitrification and denitrification or anaerobic treatment and aerobic treatment, so that part of organic substances CODcr in the wastewater is removed. Then precipitating, making the supernatant flow into a next process system, and sending the sludge to a sludge treatment center for treatment after the sludge passes through a sludge dewatering machine. After the biological degradation removes part of organic matters, the water quality also contains higher calcium and magnesium ions, and the calcium and magnesium ions are removed by adding sodium carbonate and sodium hydroxide for precipitation. The supernatant flows into the next process system.
After the two pretreatment processes, the wastewater enters an MVR evaporation crystallization system, part of heat of the wastewater is recycled through a plate type heat exchange system, the wastewater is pumped into an MVR evaporation main body through a circulating pump, the wastewater is evaporated in the evaporation main body, part of the evaporated wastewater is condensed to form condensed water, and the condensed water is discharged out of the evaporation system and is used as industrial reuse water for water inlet; the waste water which is not evaporated is circulated in the evaporation system until reaching the saturated concentration, and after reaching a certain saturated concentration, the saturated solution enters a crystallization system to finally generate crystals.
However, in the biodegradation technology, the waste water contains high inorganic salt, so that some non-degradable organic matters can not be degraded, the crystal quality is finally influenced, the waste water can not be sold as a byproduct and can only be treated as dangerous waste, and thus, the expensive secondary treatment cost is brought. Because the wastewater contains higher organic matters and calcium and magnesium ions, a large amount of medicament needs to be added, and the operation cost is very high. But also can not thoroughly remove organic matters and calcium and magnesium ions in the wastewater. In addition, the waste water contains high calcium and magnesium ions, and when the MVR evaporation equipment evaporates to a certain degree or concentration, the MVR evaporation system is easy to scale, so that the stable operation and treatment capacity of the equipment are influenced. And a large amount of manpower and material resources are needed to be added to manually clean the scale.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a waste water treatment and multi-effect vertical pipe crystallization salt separating device which is low in operation cost, low in energy consumption, good in concentration effect and capable of outputting byproducts reaching the industrial salt grade.
The technical scheme adopted by the invention is as follows: it is including pretreatment tank, electrocatalytic oxidation pond, electrodialysis unit, multistage forced circulation evaporation module and the play pond that connects gradually, waste water treatment combines multiple-effect riser crystallization to divide salt device still includes lye tank and carbon dioxide storage tank, the lye tank carbon dioxide storage tank all with pretreatment tank connects, multistage forced circulation evaporation module is including a plurality of heating evaporation module and the crystallizer that connects gradually, heating evaporation module includes the heater, multistage forced circulation evaporation module still includes plate heat exchanger, the concentrate output pipeline of electrodialysis unit process plate heat exchanger back is connected to in the heating evaporation module, all the comdenstion water output pipeline of heater collects the back process plate heat exchanger reconnection to go out the pond.
According to the scheme, the pretreatment tank, the electrocatalytic oxidation tank and the electrodialysis unit which are sequentially connected are used for carrying out hardness removal treatment, oxidation reduction organic matter removal and desalination treatment on input wastewater, so that calcium and magnesium ions in the wastewater are effectively removed, and the saltpeter analyzer are prevented from scaling. Through multistage the heating evaporation module realizes evaporating the stoste many times in order to reach the effect that improves the concentration of salt, through with all the comdenstion water output pipeline of heater is connected to plate heat exchanger, and then reduces the temperature of discharge system's comdenstion water and distilled water and reduces thermal pollution, improves simultaneously and gets into the temperature of the stoste of multistage forced circulation evaporation module reduces the energy consumption of system, improves the preheating rate of system.
One preferred scheme is that the heating evaporation module further comprises a separator and a circulating pump, the output end of the heater is connected to the inside of the separator, the tail end of the output end of the heater is provided with a sprayer, the circulating pump is connected with the bottom output port of the separator, the top of the separator is provided with a steam outlet, and the heater is internally provided with a condensation pipeline.
According to the scheme, products boiling on the heating surface are easy to form scale or generate crystals, and the concentrated solution has higher flowing speed by arranging the circulating pump, so that the scale or the crystals are avoided; meanwhile, certain pressure is provided for the concentrated solution, and the phenomenon that the concentrated solution is evaporated in the heater is avoided. By arranging the sprayer at the tail end of the output end of the heater, the concentrated solution is partially evaporated under the action of pressure difference when entering the separator, and the concentration of the concentrated solution is increased.
Preferably, the multistage forced circulation evaporation module is provided with three heating evaporation modules, a concentrated solution output pipeline of the electrodialysis unit is connected to a heater of the heating evaporation module in the first stage, and a condensation pipeline of the heater of the heating evaporation module in the first stage is connected with an external steam generator; the output end of the circulating pump is connected to the heater of the secondary heating and evaporating module, and the steam outlet of the separator is connected to the condensing pipeline of the heater of the secondary heating and evaporating module; and the last circulating pump of the heating evaporation module is connected to the crystallizer, and the crystallizer dehydrates the industrial salt crystals and outputs the dehydrated industrial salt crystals.
According to the scheme, the steam exhausted by the heating evaporation module at the upper stage provides heat to provide heat for the secondary heater.
The heater is provided with a material liquid input end and a material liquid output end, the material liquid input end is positioned at the bottom of the heater, and the material liquid output end is positioned at the top of the heater.
According to the scheme, the concentrated solution is pumped into the heater from bottom to top by the circulating pump, so that the concentrated solution flows upwards along the inner pipe of the heater, the problem of cavitation of the circulating pump can be effectively avoided, the service life of the circulating pump is prolonged, and meanwhile, the evaporation work can be continuously carried out.
One preferred scheme is, the preliminary treatment pond is including the reaction tank and the sedimentation tank that connect gradually, the lye tank the carbon dioxide storage tank all with the reaction tank is connected, sodium hydroxide is stored to the lye tank, waste water treatment combines multiple-effect riser crystallization to divide salt device still includes the flocculent jar, the flocculent jar with the sedimentation tank is connected, the supernatant in the sedimentation tank is sent to the electricity catalytic oxidation pond.
As can be seen from the above scheme, carbon dioxide is readily soluble in water to form carbonic acid. Carbonic acid is a weak acid that ionizes H in water+、HCO3 -And CO3 2-，H+Can neutralize the alkalinityOH in Water-The effect of adjusting the pH of the water is achieved, and CO3 2-With Ca in water2+、Mg2+The ion reaction generates precipitate to reduce the hardness. Due to the weak acid character of carbonic acid, in H+、CO3 2-Under the condition of continuous consumption, carbon dioxide dissolved in water can be continuously ionized to obtain CO3 2-The effect almost the same as soda softening is achieved. The carbon dioxide is a natural component of the atmosphere, is stored in a liquid state under pressure, has stable property, is non-combustible and non-corrosive, and does not increase the salt content in water. Because the molecular weight of the carbon dioxide is less than that of the soda ash, the consumption and the cost can be greatly saved. Meanwhile, the carbon dioxide has a gentle neutralization curve in the process of adjusting the pH value, particularly in the pH = 6-8 neutral stage, the pH value is still slowly changed and is difficult to be reduced below pH =6, the problem of excessive acidification is avoided, and accurate pH value control can be realized without an accurate adding control system.
One preferred scheme is that the electrocatalytic oxidation tank is connected with an external power supply, a gas recovery and purification device is arranged at the top of the electrocatalytic oxidation tank, and the gas recovery and purification device recovers and utilizes hydrogen and oxygen generated by the electrocatalytic oxidation tank.
According to the scheme, the electrocatalytic oxidation refers to a cleaning treatment process for efficiently purifying pollutants in water through chemical and physical actions under the action of an external electric field or voltage. The electrochemical oxidation method is a process in which a pollutant undergoes a direct electrochemical reaction on an electrode, or a pollutant undergoes an oxidation-reduction reaction by using a strongly oxidizing active species generated on the surface of the electrode to generate a harmless substance. The former is called direct electrochemical reaction, and the latter is called indirect electrochemical reaction. The direct electrochemical reaction can convert organic pollutants and partial inorganic pollutants into harmless substances through anodic oxidation, and the cathode can remove nitrate ions and heavy metal ions from water. The two processes are simultaneously accompanied by H evolution2And O2The current efficiency is lowered but can be prevented by the selection of the electrode material and the potential control. The indirect electrochemical reaction may utilize an electrochemical reactionThe redox agent should be generated to convert the contaminant to a benign species, in which case the redox agent generated is a mediator of the exchange of electrons between the contaminant and the electrode. Such an intermediary may be a catalyst or an electrochemically generated short-lived intermediate. Further, O may be used2Reduction to H at the cathode2O2Then generating hydroxyl free radical to further oxidize organic matters, and the technology can be used for treating pollutants such as phenol, aniline, aldehydes, cyanide and the like which are difficult to be biochemically degraded. Based on the principle, a large number of hydroxyl free radicals with extremely strong activity are generated by an electrocatalytic advanced oxidation technology, and because the oxidizing capability of the hydroxyl free radicals is extremely strong, any organic pollutant can be mineralized almost without selection. The generated hydroxyl free radicals are further subjected to addition, substitution, electron transfer, bond breaking and the like with organic compounds, so that macromolecular organic matters which are difficult to degrade in sewage are oxidized and degraded into low-toxicity or non-toxic micromolecular substances, and even directly mineralized into CO2And H2O。
One preferable scheme is that the electrodialysis unit comprises a desalting chamber, an ion exchange membrane, a partition plate and electrodes, the ion exchange membrane and the partition plate are matched to form a concentration chamber, the electrodes form a direct-current electric field in the electrodialysis unit, an input port of the desalting chamber is connected with the electrocatalytic oxidation tank, an output port of the desalting chamber is connected with the effluent storage tank, and the concentration chamber is connected with the multistage forced circulation evaporation module.
According to the scheme, the electrodialysis is a membrane separation device which utilizes the selective permeability of the membrane to separate, desalt and concentrate the charged electrolyte and the uncharged substances in the water. The main parts of the electrodialyzer are anion-cation exchange membrane, separator and electrode. The compartment formed by the partition is a channel through which the liquid flow passes; the compartment that the material passes through is the desalination chamber, and the compartment that dense water passes through is the concentration chamber, and under the effect of direct current electric field, utilizing ion exchange membrane's selective permeability, cation permeates the positive membrane, and anion permeates the negative membrane, and the ion of desalination chamber migrates to the concentration chamber, and the ion of concentration chamber can't migrate to the desalination chamber because of the selective permeability of membrane. Therefore, the salinity of the dilute chamber is gradually reduced, the salinity of the adjacent concentration chambers is correspondingly gradually increased, and the inorganic salinity in the wastewater is desalted or concentrated.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the multistage forced circulation evaporation module.
Detailed Description
As shown in fig. 1 and fig. 2, in the present embodiment, it comprises a pretreatment tank 1, an electrocatalytic oxidation tank 2, an electrodialysis unit 3, a multi-stage forced circulation evaporation module and a water outlet tank which are connected in sequence, the waste water treatment combined multi-effect vertical pipe crystallization salt separation device also comprises an alkali liquor tank 4 and a carbon dioxide storage tank 5, the lye tank 4 and the carbon dioxide storage tank 5 are both connected with the pretreatment tank 1, the multistage forced circulation evaporation module comprises a plurality of heating evaporation modules 6 and a crystallizer 7 which are connected in sequence, the heating evaporation module 6 comprises a heater 8, the multistage forced circulation evaporation module further comprises a plate heat exchanger 9, the concentrated solution output pipeline of the electrodialysis unit 3 passes through the plate heat exchanger 9 and then is connected to the heating evaporation module 6, and after being collected, the condensed water output pipelines of all the heaters 8 are connected to the water outlet pool through the plate heat exchanger 9.
In this embodiment, the heating and evaporating module 6 further includes a separator 10 and a circulation pump 11, an output end of the heater 8 is connected to the inside of the separator 10, an output end of the heater 8 is provided with a sprayer 12, the circulation pump 11 is connected to a bottom output port of the separator 10, a steam outlet 13 is arranged at the top of the separator 10, and a condensation pipeline is arranged in the heater 8.
In this embodiment, the multistage forced circulation evaporation module is provided with three heating evaporation modules 6, the concentrated solution output pipeline of the electrodialysis unit 3 is connected to the heater 8 of the heating evaporation module 6 in the first stage, and the condensing pipeline of the heater 8 of the heating evaporation module 6 in the first stage is connected to an external steam generator; the output end of the circulating pump 11 is connected to the heater 8 of the secondary heating and evaporating module 6, and the steam outlet 13 of the separator 10 is connected to the condensing pipeline of the heater 8 of the secondary heating and evaporating module 6; and the last circulating pump 11 of the heating evaporation module 6 is connected to the crystallizer 7, and the crystallizer 7 dehydrates industrial salt crystals and outputs the dehydrated industrial salt crystals.
And a material liquid input end and a material liquid output end are arranged on the heater 8, the material liquid input end is positioned at the bottom of the heater 8, and the material liquid output end is positioned at the top of the heater 8.
In this embodiment, pretreatment tank 1 is including the reaction tank 14 and the sedimentation tank 15 that connect gradually, lye tank 4 carbon dioxide storage tank 5 all with reaction tank 14 connects, lye tank 4 stores sodium hydroxide, waste water treatment combines multiple-effect riser crystallization to divide salt device still includes flocculant jar 16, flocculant jar 16 with sedimentation tank 15 is connected, the supernatant in the sedimentation tank 15 is sent to electricity catalytic oxidation pond 2.
In this embodiment, the electrocatalytic oxidation tank 2 is connected with an external power supply, and a gas recovery and purification device is arranged at the top of the electrocatalytic oxidation tank 2 and is used for recovering and utilizing the hydrogen and oxygen generated by the electrocatalytic oxidation tank 2.
In this embodiment, the electrodialysis unit 3 includes a desalination chamber, an ion exchange membrane, a partition plate, and an electrode, the ion exchange membrane and the partition plate cooperate to form a concentration chamber, the electrode forms a dc electric field in the electrodialysis unit 3, an input port of the desalination chamber is connected to the electrocatalytic oxidation tank 2, an output port of the desalination chamber is connected to the effluent tank, and the concentration chamber is connected to the multistage forced circulation evaporation module.
The utility model discloses a work flow includes following step:
a. the wastewater is sent to the pretreatment tank 1, and calcium and magnesium ions in the wastewater react with carbonate ions through the reaction tank 14 to form a precipitate in the sedimentation tank 15, so that the hardness is reduced;
b. then the supernatant of the sedimentation tank 15 is sent to the electrocatalytic oxidation tank 2, the wastewater is subjected to oxidation-reduction reaction under the action of an external electric field to remove organic pollutants, nitrate ions and heavy metal ions in the wastewater, and the generated hydrogen and oxygen are recovered through the gas recovery and purification device;
c. then, after the treatment solution is sent to the electrodialysis unit 3, the salinity concentration in the desalting chamber is reduced through the electrodialysis principle, the concentrated solution in the concentrating chamber is sent to the multistage forced circulation evaporation module, and the desalted fresh water is sent to the water outlet tank;
d. the concentrated solution is preheated by absorbing heat through the plate heat exchanger 9, then enters the heater 8 of the heating evaporation module 6 of the first stage to absorb heat generated by an external steam generator, and then is uniformly sprayed in the separator 10 of the first stage through the sprayer 12, partial water of the concentrated solution is evaporated into steam under the action of pressure difference when entering the separator 10, and the steam is removed through the steam outlet 13, and the bottom concentrated solution is output to the heating evaporation module 6 of the second stage under the action of the power of the circulating pump 11;
e. the steam output by the first-stage heating and evaporating module 6 enters the heater 8 of the second-stage heating and evaporating module 6, meanwhile, the steam exchanges heat with the concentrated solution conveyed by the first-stage circulating pump 11, the steam is condensed into water and then is conveyed to the plate heat exchanger 9 to provide heat for the stock solution, the concentrated solution output by the first stage enters the second separator 10 to evaporate the water again, and similarly, the two second-stage heating and evaporating modules 6 and the third-stage heating and evaporating modules 6 sequentially evaporate for the second time and the third time;
f. the concentrated solution is in a solid-liquid mixed state after three-stage evaporation, the mixed solution is conveyed to the crystallizer 7 under the driving of a liquid pump, the crystallizer 7 is used for solid-liquid separation, the solid is packaged into a product through an external packaging system, and the centrifugal mother solution is collected or reflows into the multistage forced circulation evaporation module.
The invention is applied to the technical field of wastewater treatment.
While the embodiments of the present invention have been described in terms of practical embodiments, they are not to be construed as limiting the meaning of the present invention, and modifications of the embodiments and combinations with other embodiments will be apparent to those skilled in the art in light of the present description.
Claims (7)
1. The utility model provides a waste water treatment combines multiple-effect riser crystallization to divide salt device which characterized in that: it is including pretreatment tank (1), electrocatalytic oxidation pond (2), electrodialysis unit (3), multistage forced circulation evaporation module and the play pond that connects gradually, waste water treatment combines multiple-effect riser crystallization to divide salt device still includes lye tank (4) and carbon dioxide storage tank (5), lye tank (4) carbon dioxide storage tank (5) all with pretreatment tank (1) is connected, multistage forced circulation evaporation module is including a plurality of heating evaporation module (6) and crystallizer (7) that connect gradually, heating evaporation module (6) are including heater (8), multistage forced circulation evaporation module still includes plate heat exchanger (9), the concentrate output pipeline of electrodialysis unit (3) passes through be connected to behind plate heat exchanger (9) in heating evaporation module (6), all pass through after the comdenstion water output pipeline of heater (8) collects plate heat exchanger (9) and reconnect Is connected to the water outlet pool.
2. The wastewater treatment combined multi-effect riser crystallization salt separation device according to claim 1, characterized in that: heating evaporation module (6) still includes separator (10) and circulating pump (11), the output of heater (8) is connected to the inside of separator (10), the output end of heater (8) is provided with sprinkler (12), circulating pump (11) with the bottom delivery outlet of separator (10) is connected, the top of separator (10) is provided with steam outlet (13), be provided with the condensation duct in heater (8).
3. The wastewater treatment combined multi-effect riser crystallization salt separation device according to claim 2, characterized in that: the multistage forced circulation evaporation module is provided with three heating evaporation modules (6), a concentrated solution output pipeline of the electrodialysis unit (3) is connected to a heater (8) of the heating evaporation module (6) in the first stage, and a condensation pipeline of the heater (8) of the heating evaporation module (6) in the first stage is connected with an external steam generator; the output end of the circulating pump (11) is connected to the heater (8) of the secondary heating and evaporating module (6), and the steam outlet (13) of the separator (10) is connected to the condensing pipeline of the heater (8) of the secondary heating and evaporating module (6); and a circulating pump (11) of the last heating evaporation module (6) is connected to the crystallizer (7), and the crystallizer (7) dehydrates industrial salt crystals and outputs the dehydrated industrial salt crystals.
4. The wastewater treatment combined multi-effect riser crystallization salt separation device according to claim 3, characterized in that: the feed liquid heating device is characterized in that a feed liquid input end and a feed liquid output end are arranged on the heater (8), the feed liquid input end is located at the bottom of the heater (8), and the feed liquid output end is located at the top of the heater (8).
5. The wastewater treatment combined multi-effect riser crystallization salt separation device according to claim 1, characterized in that: pretreatment tank (1) is including reaction tank (14) and sedimentation tank (15) that connect gradually, lye tank (4) carbon dioxide storage tank (5) all with reaction tank (14) are connected, sodium hydroxide is stored in lye tank (4), waste water treatment combines multiple-effect riser crystallization to divide salt device still includes flocculant jar (16), flocculant jar (16) with sedimentation tank (15) are connected, the supernatant in sedimentation tank (15) is sent to electrocatalytic oxidation pond (2).
6. The wastewater treatment combined multi-effect riser crystallization salt separation device according to claim 1, characterized in that: the electrocatalytic oxidation pond (2) is connected with an external power supply, a gas recovery and purification device is arranged at the top of the electrocatalytic oxidation pond (2), and the gas recovery and purification device can recycle hydrogen and oxygen generated by the electrocatalytic oxidation pond (2).
7. The wastewater treatment combined multi-effect riser crystallization salt separation device according to claim 1, characterized in that: the electrodialysis unit (3) comprises a desalting chamber, an ion exchange membrane, a partition plate and electrodes, the ion exchange membrane and the partition plate are matched to form a concentration chamber, the electrodes form a direct current electric field in the electrodialysis unit (3), the input port of the desalting chamber is connected with the electrocatalytic oxidation tank (2), the output port of the desalting chamber is connected with the water outlet tank, and the concentration chamber is connected with the multistage forced circulation evaporation module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110498549A (en) * | 2019-04-26 | 2019-11-26 | 中创水务科技环保(广东)有限公司 | A kind of crystallization of wastewater treatment combination multiple-effect standpipe divides salt technique and device |
| CN112591973A (en) * | 2020-12-25 | 2021-04-02 | 淄博格瑞水处理工程有限公司 | Reclaimed water recycling zero-emission system |
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2019
- 2019-04-26 CN CN201920586195.0U patent/CN209835873U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110498549A (en) * | 2019-04-26 | 2019-11-26 | 中创水务科技环保(广东)有限公司 | A kind of crystallization of wastewater treatment combination multiple-effect standpipe divides salt technique and device |
| CN112591973A (en) * | 2020-12-25 | 2021-04-02 | 淄博格瑞水处理工程有限公司 | Reclaimed water recycling zero-emission system |
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